[ncl-talk] saturation vapor pressure for mixhum_ptrh function

[Dave Allured - NOAA Affiliate]

General advice:

(1)  Check the NCL on-line function docs first.

(2)  In some cases, the NCL examples pages have supplemental documentation
for NCL functions.

(3)  Search the NCL source code.  Frequently there is extra documentation
within source code routines for scientific functions, because these were
often imported from other documented scientific packages.  There is also
the code itself, of course.

The internal code for this function is
*ncl_ncarg-6.6.2/ni/src/lib/nfpfort/mixhum_ptrh.f*.  This is called by a
wrapper function in *ncl_ncarg-6.6.2/ni/src/lib/nfp/mixhumW.c*.


On Thu, Aug 18, 2022 at 1:58 PM Manisha Ganeshan via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hello,
>
> I'd like to use the *mixhum_ptrh* function to obtain the specific
> humidity (given temperature, pressure, and relative humidity). I'm
> wondering what equation this function assumes to estimate the saturation
> vapor pressure, and whether there are any differences in the assumption
> regarding saturation w.r.t liquid water versus saturation w.r.t. ice?
>
> Thanks,
> Manisha
> --
> Dr. Manisha Ganeshan
> Morgan State University
> Maryland, U.S.A.
>
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